Microwave-assisted synthesis of pyrazolo[3,4-b]pyridine-spirocycloalkanediones by three-component reaction of 5-aminopyrazole derivatives, paraformaldehyde and cyclic β-diketones
作者:Jairo Quiroga、Jorge Trilleras、Dayana Pantoja、Rodrigo Abonía、Braulio Insuasty、Manuel Nogueras、Justo Cobo
DOI:10.1016/j.tetlet.2010.07.009
日期:2010.9
New pyrazolo[3,4-b]pyridine-5-spirocycloalkanedione derivatives were prepared via three-component reaction between 5-(4-R-benzylamino)pyrazoles, cyclic β-diketones and paraformaldehyde. The use of indandione as β-diketone resulted in the formation of two products, the pyrazolo[3,4-b]pyridine-5-spiroindanediones and 3-tert-butyl-1-phenylindeno[2,3-e]pyrazolo[3,4-b]pyridine. The structures of the pyrazolo[3
通过5-(4- R-苄氨基)吡唑,环状β-二酮和低聚甲醛的三组分反应制备了新的吡唑并[3,4- b ]吡啶-5-螺环烷二酮衍生物。使用茚满二酮作为β-二酮导致形成了两种产物,即吡唑并[3,4- b ]吡啶-5-螺茚并二酮和3-叔丁基-1-苯基茚并[ 2,3- e ]吡唑并[3]。 ,4- b ]吡啶。通过单晶X射线衍射确认了吡唑并[3,4- b ]吡啶-5-螺环烷二酮的结构。该方案提供了一种简单的一步合成方法,具有后处理容易,反应条件温和且对环境无害的优点。